修复了编译报错的问题。review by 孙凯。

@@ -70,7 +70,8 @@ export default class BrandStore extends Component {
             duration: 255,
             children: message,
             animationEnd : () => {
-                this._toast && this._toast._toastAnimationToggle = setTimeout(
+                if(this._toast){
+                    this._toast._toastAnimationToggle = setTimeout(
                         () => {
                             this._toast && this._toast.hide({
                                 duration: 0,
@@ -81,6 +82,7 @@ export default class BrandStore extends Component {
                         1000
                     );
                 }
+            }
         })
     }